On Amazon EC2 this isn’t working:
$ sudo certbot certonly --standalone -d staging.my_domain123.com --email admin@my_domain123.com debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org Obtaining a new certificate Performing the following challenges: http-01 challenge for staging.my_domain123.com Waiting for verification... Cleaning up challenges Failed authorization procedure. staging.my_domain123.com (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://staging.my_domain123.com/.well-known/acme-challenge/WiPPjIaTOrcMXRVCePqwdAp5bTrDkN_-pl8QOq9ph0A: Timeout during connect (likely firewall problem) IMPORTANT NOTES: - The following errors were reported by the server: Domain: staging.my_domain123.com Type: connection Detail: Fetching http://staging.my_domain123.com/.well-known/acme-challenge/WiPPjIaTOrcMXRVCePqwdAp5bTrDkN_-pl8QOq9ph0A: Timeout during connect (likely firewall problem) To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address. Additionally, please check that your computer has a publicly routable IP address and that no firewalls are preventing the server from communicating with the client. If you're using the webroot plugin, you should also verify that you are serving files from the webroot path you provided.
, although the port 443 is open